I found this patch in my local tree which avoids copying a bitmap
by doing
bitmap_and_compl (&tmp, op2, dense_invalidated);
instead of
bitmap_copy (&tmp, op2);
bitmap_and_compl_into (&tmp, dense_invalidated);
which should besides speed also eventually reduce peak memory
usage.
Bootstrap and regtest running on x86_64-unknown-linux-gnu, ok for trunk?
Thanks,
Richard.
2014-03-18 Richard Biener <rguent...@suse.de>
* df-problems.c (df_rd_confluence_n): Avoid bitmap_copy
by using bitmap_and_compl instead of bitmap_and_compl_into.
(df_rd_transfer_function): Likewise.
Index: gcc/df-problems.c
===================================================================
--- gcc/df-problems.c (revision 208642)
+++ gcc/df-problems.c (working copy)
@@ -479,8 +479,7 @@ df_rd_confluence_n (edge e)
bitmap_head tmp;
bitmap_initialize (&tmp, &df_bitmap_obstack);
- bitmap_copy (&tmp, op2);
- bitmap_and_compl_into (&tmp, dense_invalidated);
+ bitmap_and_compl (&tmp, op2, dense_invalidated);
EXECUTE_IF_SET_IN_BITMAP (sparse_invalidated, 0, regno, bi)
{
@@ -524,14 +523,13 @@ df_rd_transfer_function (int bb_index)
problem_data = (struct df_rd_problem_data *) df_rd->problem_data;
bitmap_initialize (&tmp, &problem_data->rd_bitmaps);
- bitmap_copy (&tmp, in);
+ bitmap_and_compl (&tmp, in, kill);
EXECUTE_IF_SET_IN_BITMAP (sparse_kill, 0, regno, bi)
{
bitmap_clear_range (&tmp,
DF_DEFS_BEGIN (regno),
DF_DEFS_COUNT (regno));
}
- bitmap_and_compl_into (&tmp, kill);
bitmap_ior_into (&tmp, gen);
changed = !bitmap_equal_p (&tmp, out);
if (changed)
